Introduction

The STM32WL3x MCUs are high performance ultra-low power wireless application microcontrollers, which integrate an RF

transceiver for low-power wide-area network (LPWAN). They are designed to operate in license-free ISM and SRD frequency

bands such as 433, 868 and 915 MHz.

This document describes the precautions needed to achieve the best RF performance of the STM32WL3x.

This document applies to a 4-layer board design based on the VFQFPN48 (6x6x0.9, pitch 0.4 mm) and VFQFPN32 (5 x 5 mm,

0.50 mm pitch) package.

Table 1. Applicable products

Type Products

This document applies to the STM32WL3x Arm

Note: Arm is a registered trademark of Arm Limited (or its subsidiaries) in the US and/or elsewhere.